Slifer the Sky Dragon does not have a chant; The Winged Dragon of Ra does. If that's what you meant, it is as follows, though note that this is dub only; it is incomprehensible in the original Japanese.
"Great beast of the sky, please hear my cry.
Transform thyself from orb of light and bring me victory in this fight.
Envelop the desert with your glow and cast your rage upon my foe.
Unlock your powers deep within so that together we may win.
Appear in this Shadow Game as I call your name,
Winged Dragon of Ra!"
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sky dragon feel my power summon thee for the hour with red scales and yellow eyes rise for my enemys demies come out slifer
Gregorian chant
Charlie Weasley worked with dragons.
marks indicating the contour of a chant melody.
antiphonal psalmody